JSON不能编码为json或UTF-8？

I am having some headaches with JSON not returning as JSON. I get no errors, just no data. The browser shows the data in the response.

我有一些令人头疼的问题，JSON没有以JSON身份返回。我没有错误，只是没有数据。浏览器显示响应中的数据。

I know it's not returning as JSON because setting the dataType in the AJAX section causes it to display nothing. If I remove the dataType statement, it displays the data.

我知道它不会以JSON形式返回，因为在AJAX部分设置dataType会导致它不显示任何内容。如果我删除dataType语句，它将显示数据。

I've played around with encoding in the connection string, in the queries, as a header, and in the AJAX section all to no avail. My database is in UTF-8, general_ci.

我在连接字符串，查询，头文件和AJAX部分中使用编码都无济于事。我的数据库是UTF-8，general_ci。

AJAX:

AJAX：

$.ajax({

            contentType: 'application/json; charset=UTF-8',
            data: {'career' : $career},
            dataType: 'json',
            url: 'functions.php',
            success: function(data) {

                $("careerdata").html(data);

            },

PHP:

PHP：

if (isset($_GET['career'])) {

    require_once 'config.php';

    $query = $dbconnect->prepare("select * from jobs where Category = :category");
    $query->bindParam(':category', $category);
    $category = $_GET['career'];
    $query->execute();

    $result = $query->fetchAll(PDO::FETCH_ASSOC);

    echo json_encode($result);

    $dbconnect = null;

    return;

} else {

    echo 'No career data found.'; 

};

Connection file:

连接文件：

try {

$dbconnect = new PDO("mysql:host=$host;dbname=$database", $user, $pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'));

$dbconnect->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

}

catch(PDOException $e) {

echo "Connection failed: " . $e->getMessage();

};

If any more info is needed, please let me know.

如果需要更多信息，请告诉我。

Working page is https://www.shardsmith.com/career.php and the actual query is https://www.shardsmith.com/functions.php (but it won't work independently because of the GET variable).

工作页面是https://www.shardsmith.com/career.php，实际查询是https://www.shardsmith.com/functions.php（但由于GET变量，它不能独立工作）。

2 个解决方案

#1

It seems that the MySQL (php) client does assume another client encoding than UTF-8. You can request the correct encoding using

似乎MySQL（php）客户端确实假设另一个客户端编码而不是UTF-8。您可以使用请求正确的编码

$dbhconnect->exec("SET NAMES utf8");

directly after you connect to the database.

直接连接到数据库后。

Alternatively, you can use PDO::MYSQL_ATTR_INIT_COMMAND (see http://php.net/manual/de/ref.pdo-mysql.php) in your connection config:

或者，您可以在连接配置中使用PDO :: MYSQL_ATTR_INIT_COMMAND（请参阅http://php.net/manual/de/ref.pdo-mysql.php）：

$dbconnect = new PDO("mysql:host=$host;dbname=$database", $user, 
   $pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'));

And be careful with unchecked frontend parameters: this is an open door for SQL injections. Either use a prepared statement like this:

并且要小心未经检查的前端参数：这是SQL注入的一扇门。要么使用这样的预备语句：

$query = $dbconnect->prepare("select * from jobs where Category = :cat");
$query->execute(array(':cat' => $_GET['career']));

or escape the input paramerers first:

或首先转义输入参数：

$cat = $dbhconn->quote($_GET['career']);
$res = dbhconnect->query("select * form jobs where Category = {$cat}")->fetchAll();

#2

I ended up figuring it out myself. The json itself was fine. At some point I completely forgot about each-looping through the key-value pairs in order to actually display them. For example:

我最终自己搞清楚了。 json本身很好。在某些时候，我完全忘记了通过键值对的每个循环，以便实际显示它们。例如：

$.each(data, function(key,value) {

    var $itemid = value.ItemID;
    var $db = value.DB;
    var $job = value.Job;
    var $recipe = value.Recipe;
    var $level_range = value.Level_Range;
    var $level = value.Level;
    var $grade = value.Grade;
    var $rarity = value.Rarity;
    var $complete = value.Complete;

    $("careerdata table").append("<tr class=\"recipe\" id=\""+$recipe+"\">"

        +"<td>"+$level+$grade+"</td>"

        +"<td class=\"icon\"><a href=\"http://na.finalfantasyxiv.com/lodestone/playguide/db/"+$db+"/"+$itemid+"/\" class=\"eorzeadb_link\"><img style=\"background: url(\'/images/items/"+$job+"/"+$itemid+".png\') 0 1px/42px 42px;\" src=\"/images/items/reflection.png\" /></a></td>"

        +"<td class=\""+$rarity+"\">"+$recipe+"</td>"

        +"<td><input class=\"complete\" type=\"checkbox\" value=\""+$complete+"\"></td>"

    +"</tr>");

});

#1